I think the “wiretapping” thing is an invention of the authorities in order to make the charges more serious and that if the prosecutors try to push it, they won’t have much evidence.
The guys can say that the phone ruse was just to get into the building.
As to “veritas”, it could just be bravado on O’Keefe’s part.
The inside office was a US Senator's field office. There are many such places. None of them are considered secret installations or whatever.
You just go visit the office ~ thousands of people do that every day.